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

Renko Usami can't resist sneaking off with him, dropping to her knees for a sloppy, eager blowjob even though they both know they shouldn't—but the real shock comes when Maribel Han catches them mid-act. Instead of putting a stop to it, Merry leans in for a taste of her own, and what began as a hidden affair turns into a breathless three-way. Soon Renko is riding him bare and shameless while Maribel teases him with the ultimate question—which of them felt the best?