Today I will focus on yaoi's with threesomes, since I've re-read one recently! (you can find any series I post on mangago)
Futari No Musuko Ni Nerawarete Imasu by Kamon Saeko
Plot - Keiichi is raising his twin sons, Ren and Takumi, who aren’t connected to him by blood. Ren is a promising future researcher and Takumi is a national swimmer. Keiichi’s always wanted to give his two excellent sons whatever they wish for, but on their 20th birthday they unexpectedly started pestering him about... “They want... my body?!” Kamon Saeko draws the crazy love triangle of two boys that want to stay with “me” both as family and as lovers! This is one of my favourite yaoi stories with threesomes, since I just never read a plot like this, and because of the hot smut action going on. And personally, I love it when the older guy gets topped by someone younger, and now by 2 people younger than him! It's a great story, unless you hate incest-like stories.
Uchi wa Futago de Teippai by Kamiya Memo
Plot - As the eldest son for the Kadokura family, Kouhei's biggest worries are his younger twin brothers, Aoya and Shion. Despite always being foiled in love by his younger brothers, the virgin Kouhei has finally landed himself a matchmaking session. But, saying "our true desire is you, big brother," the twins pounce and teach Kouhei how to feel good! I personally LOVE this one, again it's incest. 'Cause you know, Incest is Wincest! But this one also kinda made me laugh, since it went kinda fast with the plot, and the twins just don't care that they're ruining their brothers love life xD
Docchi ni Suru? by Aiba Kyoko
Plot - The super normal university student, Hiroo Eiji has a problem. That is, he can’t become popular because he always has two extremely handsome but forceful childhood friends, Haruki and Ikumi, besides him. However, when he received the first love letter in his life, he got confessions from both of them saying, “You can’t go out with a girl. I’ve been in love with you all this time…” and then they set him up and do super perverted stuffs with him…?! This is another one that made me laugh throughout the series, because of the hilarious reactions! But it's really cute, since it's also between childhood friends, which is always a cute bonus~ I find this one to be extremely fluffy, even do most of the manga's on this list are, I find myself to find this the cutest. Probably because of the childhood friends situation.
Ryoute Ni Darling by Uzuki Jun
Plot - Childhood friends, Kou who is constantly being spoiled by Hodaka are now living their comfortable university life together. At the same time Kou who is completely taken in by his Kouhai’s charm ‘Mikio’ who keeps coming in his room uninvited. But how will Hodaka react to Mikio’s straightforward approach towards his affection to Kou? Will the kind hearted Hodaka be able to continue to hold back or will he lose his self control altogether!? The childhood friend seme and the puppy like kouhai seme. Which would this selfish and sweet tooth Kou choose?! This is also one that I find very cute! It also has a childhood friend again, the comedy is just great and t he different personalities of the seme's are so funny to me! Great and cute read~ and the fact that the uke loves sweets just adds a cuteness factor to it!
Bokura No Mitsudomoe Sensou by Shoowa
Plot - Takahiko can't stand Aizawa, a student in another class. As for the reason why, it seems that Aizawa has his eye on Takehiro, a mutual friend.To save Takehiro from Aizawa's evil clutches, Takahiko plans an onsen trip so he can reveal Aizawa's true colors. However, when he hears about this idiotic plan, Takahiko's best friend Magi is nice enough to play along, but...Of course there's no way it could all go according to plan. The result is something Takahiko never anticipated! This threesome just made me laugh! The art and reactions of the uke were just so funny to me, and I had to add this to the list. It's a good story, but I personally was just laughing while reading the threesome, well just throughout the manga. Damn I'm messed up. (The threesome takes place in chapter 2 of the manga)
Choco Strawberry Vanilla by Psyche Delico
Plot - Hiroi always shared what he liked, things and people alike, with his childhood friend Take. Take always returned Hiroi's affections. Mine, who because of his deep love for Hiroi, accepts both of them. The relationship of these three classmates was in a good balance, but because of a subtle change in their feelings, this balance slowly gets unhinged...?! This story, in my opinion, is kinda messed up, which I do understand since it's a psychological yaoi. It is good, but NOT for everyone's taste, I personally even have mixed feelings about this story, since it isn't bad, but I'm not really a fan of psychological yaoi series. But since this is one of the better ones I've read, I just thought I would add!
Oboreru Triangle by Shiramatsu
This is a new series with only 1 chapter released until now, so I can't really summarize what's it about yet, since I don't even know 100% myself yet. But what I can say already is that I LOVE it. The art is great, the story is quite unique from what I've read in the first chapter until now, and even do nothing happend yet for the threesome, it is coming! And I can't wait to read the next chapter! So this is DEFINITELY a recommended manga!