Docchi ni Suru?
1 story: 1 uke, 2 semes, always a threesome even though the semes hate each other they still love the uke. They "all" are childhood friends. 2 story: A guy works at a company. He has a kohai there. He has a crush on him. One day they drank some sake and ended up in a hotel. They has sex - the senpai being the uke (unwillingly at first).
Pet's Aesthetics
Redhead and blonde are childhoodfriends. They're adults now. Redhead always had a crush on the blonde girl. The blonde girl seems like a "player" - just kisses her when she is bored. Anyway the blonde girl actually likes the redhead girl. They end up sleeping together.
Maki-chan wa Kare to Sex Shitai
A guy Maki and his childhood friend Shuu. Maki is a sensitive person (and tsundere). He sees Shuu like his kind hearted big brother and he likes him. But Shuu might be a psychopath a little... just saying. Story: They started to date but they haven't had sex cause Shuu doesn't want to (Maki is really like a crybaby so Shuu might be just taking it slow... like really slow, cause during the year of going out, they haven't had sex + he's waiting for Maki to end high school). Anyway, Maki gets raped by 3 guys one day and Shuu beats the crap out of those 3 (even taking one guy's teeth by pulling them out of his mouth with his bare hands... Ehm... I mean... Ouch!) and then he sold them for gay sex videos!... Ok Shuu's a little messed up in his head... Well in the end they (Shuu and Maki) slept (with sex this time) together. I actually like Shuu's personality - kind, nice and loyal to someone he loves, but others are worse than rats to him.
Mamanaranai Mon de
There are 5 friends who meet up often. One guy there, Chika, has a crush on another guy, Hotaka, in the group. One day Chika goes for it and Hotaka accepts cause he thinks that Chika will get bored. They date for a while but Hotaka doesn't fall for him so Chika eventually gives up. This leads to Masato, another guy from the group who was married and had a kid but his wife found another guy at that time and they planned the divorce, going for Hotaka, who he had a crush on since childhood. They start to date butnow Hotaka has feelings for him too. He just doesn't realise it himself.
Doushiyoumonai Renjo
2 guys, childhood frineds, students and then adults. They end up together. One thinks he's weird cause he has a crush on the other dude so he haven't told him - dude K. The other dude - dude T - has a crush on him too but he wasn't able to confess cause the first guy (K) though it was weird so he yelled at him (T). T's family moved and he became empty - didn't feel a thing. After some time (years) T met K by accident and T became all yandere like. He kinda raped K too. They still ended up together though.
Kyou Kara Omega ni Narimashita
2 childhood friends. One is an alpha an the other is a late bloomer Omega (thought he was a Beta and just got his heat). They start to live together but they're not mates still cause the alpha is worried. And now they're in the middle of a misunderstanding. They both love each other but they don't know it - they haven't said something like: "I love you," for a long time. They do that in the last chapter - chapter 5. They end up as mates.
Shounen No Kyoukai
Kaoru (alpha), Yuka (omega), Taiga (alpha), Rin (omega) Kaoru x Yuka - childhood friends, a couple (but not the fated couple) Taiga x Rin - just sex bodies Taiga's fated pair is Yuka and Kaoru's fated pair is Rin... Story: It's messed up at the beginning. It starts in a high school. They had a physical exam where they find out the second gender of the students. Yuka turns out to be an omega and his childhood friend Kaoru turns out to be an alpha. Yuka's buddies are mostly Betas but one of them, Taiga, is also an alpha. Taiga went into really bad rut and it affected other alphas too. Taiga tried to rape Yuka but Kaoru took his place and made a pair with Yuka. In the end Taiga finds out that omegas smell the same except the omega he's supposed to be in a fated pair with an alpha. At that moment he realises that Yuka is his fated omega but he doesn't go for it cause he has remorse of conscience. As an adult Taiga goes out with a younger omega dude Rin. But they are not a pair. One day Rin and Yuka meet at the hospital. Rin gives him some tickets to the restaurant he works at. Yuka goes there with Kaoru and Kaoru goes into rut. Turns out that Kaoru's fated pair is Rin. Now they are in this mess where Kaoru is in a pair with Yuka. Kaoru knows now that Yuka isn't his fated pair but he still doesn't want to leave Yuka cause they are childhood friends. Yuka got 2 and 2 together and knows that Taiga is his fated pair and Rin is Kaoru's fated pair. Taiga knew about his fated pair being Yuka all along and Rin is trying to get Kaoru. In the end Taiga bit Rin's neck - making them pair. So everything works out in the end - even though they're not fated pairs. Think I've read ch. 12. 5
Bokutachi Wa Asu Ni Mukatte Ikiru No Da