Tsugai ni Narenai!
Ritsu is an omega who's always wanted to seduce his childhood friend, Satoshi, even though Satoshi is a beta, so he decides to pretend to be totally slutty to do it! Except Satoshi is totally an alpha who is using every trick in the book to keep Ritsu by his side. Trigger warnings: lying/manipulation, dubcon.
Shinobu Koi hodo -Suki sugiru Danna-sama ni Dekiai saretemasu-
Ayame lives in a ninja village but sucks at being a ninja, and her one solace is watching her secret love, the future village chief, Shoma. But when she hears he's getting married, she decides she needs to step it up and move on with her life, so she asks to learn seduction techniques so she can work as a ninja. To her surprise, Shoma herself is her teacher on the night of, and the next day, he asks her to marry him! Ayame is under the impression Shoma loved someone else so he was forced to marry her, but really he's been in love with Ayame for a long time. Had some cute moments, but honestly, Shoma is a red flag. I lost interest and stopped reading around chapter 30.
Shingeki no Kyojin dj - Fan Service - Omegaverse