[Joji Panchu Uriba (emina)] Onee-chan Wants to Steal My Virginity!

A doting older childhood friend decides her little Ren-kun's sex education can't wait a day longer, kicking things off with a hands-on lesson where her enormous soft breasts press against him while she coaches him through stroking his tiny cock to completion. She rewards his progress by letting him nurse at her plump nipples and wrapping her skilled fingers around him, all cheerful encouragement and heart-marked praise. But the final exam is one only she can administer—stealing his virginity with a deep cowgirl ride that ends exactly where she insists sex is truly complete.