Juyeon's Jinx sounds like it fits that perfectly (but I believe there's no sex until the side story at the end if that matters)
Also A Studio Apartment Will Suffice and Sabita Yoru Demo Koi Wa Sasayaku both have kinda shy tops. reply
Lowtide twilight, his the biggest cinnamon role in yaoi history also jinx trust me his a sweet heart. And last but most definitely not least love history caused by willful negligence reply