[Sugimura Mugita] Buff Me☆Robita (Eroi Hodo Saikyou!? Dungeon de Sex Musou Anthology Comic) [BBts]

Little Robita wears the collar and leash marking him as his adventuring guild's most precious asset: a boyish sex buffer who can empower exactly one woman per day with his body. His monster-hunting harem—a twintailed elf mage, a masked kunoichi, and a towering muscle-bound oni packed with huge breasts—bicker over their nightly turns under a busty nun's strict one-a-day rule, right up until the dark-skinned Demon Lord Lunartica springs her trap and steals his daily buff deep inside her dungeon. What follows is a frantic scramble to salvage the raid, ending with Robita servicing all three ravenous teammates at once and leaving every stat gauge pinned at MAX.