[Denpaesidan (Shiroshi)] Himitsu no. (Touhou Project) [Shiririn]

Renko Usami drags a lucky guy into a back room for a secret tryst, only to find his huge cock barely fits past her lips — and things get even riskier when her best friend Maribel walks in on them mid-blowjob. Instead of raising hell, Merry drops to her knees for a taste of her own, kicking off a breathless ffm threesome where the two bisexual girls take turns riding him cowgirl and teasingly demand to know which of them feels best. Caught between Renko's eager squeezing and Merry's playful competition, his biggest secret becomes how long he can possibly hold out.