Kurui Naku No Wa Boku No Ban
Takaba is an alpha who refuses to have sex with an omega, too traumatised from childhood memories of his father sleeping with different men every day as sex work. He meets Karasuma, an omega willing to sleep with anyone to climb the corporate later. But he's not quite what he seems
Kiss Shite Yowamushi-kun!
[There isnt any shotacon, i just noticed that tag... the last couple has an age gap but its not underage afaik?] 1-2 Sawa is a college student, who was confessed to by Ono, a high school senior. They work together at the same bookstore, and Sawa might be falling in love with Ono's adorable personality 2 - Yoshihiko is a 31 year old man, who lives alone and wants more zest in life. And then he meets the adorable ghost boy who lives in his house 3 - Hidaka meets and starts dating Leo, a transfer student who moved into his class. It turns out Leo is also the same boy Hidaka relentlessly bullied as a kid (and Leo knows) 5. Kuro is a neko boy, who's master is always thinking about a boy just like him, Akira. Kuro thinks he's a replacement, and is bitter. But that's not it at all
Retsujo Love Cross
Leo goes on an onsen trip with his (unromantic) boyfriend, where he meets and has sex with a man named Ryouta. It was only a fling, but then Ryouta shows up at Leo's company as an associate (and becomes his sex friend/fake boyfriend, because of Leo's stalker ex)
Following Namsoo To The Bathhouse
I'm not rereading this But from what i remember, the mc gets a massage from a bathhouse guy, gets hot and bothered, and comes back a bunch to see him. And then they have sex? And then there was like weird drama plot that i don't remember?
Hot and Cold
Ookami Shounen To Hamu No Hito
Yuudai is in the closet, and puts up a straight pervy act for everyone, even though he has a crush on his friend, Kimikazu. But after a party, Kimikazu fucks Yuudai, who can't break past his fake persona of a straight boy. He pretends to not remember in the morning, and they lose contact after that (but meet again in Tokyo years later)
Itoshi no XL Saizu
Yamamoto goes to the sake research club of his campus and ends up meeting (and having sex with) Kobayashi, a hot guy who has a huge dick and hasn't had sex -- because girls are afraid of it. Yamamoto offers to help him out, and gets fucked so hard he passes out. This is the beginning of their love story.
Kyou Kara Omega ni Narimashita
Munechika is an alpha, Kanade is a beta.... until he's not. He goes into heat, spending it with his childhood friend. Soon enough, their parents decide for them to move in together, and become mates. But Munechika seems reluctant, and it's tearing at Kanade's heart-- he's been in love with his best friend since forever
Ichimai Goshi Fetish
Mc becomes a model so he can have costumes made for his game department at school, but he's modeling for a guy who puts him in a tight bodysuit and they become sex friends (to lovers, if i may add)
Renchin!