1. Where a seme is popular with girls/women but rejects them because he's actually secretly in love with the uke who is unpopular with girls/women and envious of the seme.
Bonus points if the seme always seems to steal the girl/woman that the uke has a crush on or wants to confess to.
Maybe, Yamato Nase's Saa Koi ni Ochitamae?
2. Where a seme holds a uke captive (plus rape?), maybe because of a debt owed by the uke or his family. The seme's always been secretly in love with the uke.
Bonus points if they're childhood friends.
A manga that came into my mind is Haruka Minami's Saihate no Kimi e.
I don't really like these two mangakas when it comes to plot but Saihate no Kimi e really checks out what you're looking for, at least i thing it does. And it has a pretty good plot too, very dramatic. They're both okay though. Hope this helps