Koishite Kiss shite Kanjaitai

Akihiro, an omega, has suddenly been landed with a fiance! The whole thing was arranged by their parents, so when he's told this guy is going to be his husband, it's all too much to process... But, when he meets his betrothed, Reiya, his terror toward the alpha begins to change into... something else. He wants to do all kinds of naughty things with his beloved Reiya, but he's still in school, and he's worried that any prohibited activities might result in a baby... His mind is now a battlefield between hope and reason! Meanwhile, Reiya, who once found Akihiro timid and boring, finds his curiosity has been piqued. Now, he's fallen hook, line, and sinker. He's ready to go at any time!

(Source: Renta!)