Blooming Love: My Boyfriend's Gentle Discipline

You're too unguarded. She's a naive late bloomer who's no good with men, and he's a domineering fiend who's after her body... and now they're living together, despite not dating...! She thought he was a kind-hearted and good-looking gentleman, but it turns out he's a rude, overbearing perv. Still, the more time she spends with him, the more she discovers a sweeter side to him and even depends on him... The candid nature of this devilish man awakens romantic feelings she's never before experienced. Source: MangaPlaza