San-Choume's Club Bee: The Harem Night Of A Honey-Covered Boy Virgin

From Renta!:

"Please... make me all gloopy." Hajime is a plain guy who works at a flower shop. One morning, he delivers flowers to a host club in a glowing neon downtown district, when he's suddenly dragged into a sexy battle for No. 1 between the hosts! He gets his nipples and his crotch played with, until his body heats up and starts to melt! He sticks out his ass like they tell him to, and his body is tortured by the pleasure... then the hosts suddenly get serious! It's a hot host X unpopular plain virgin boy multi-orgasmical harem night love manga!!