[Hoshino Darts] x♥ERO♥x (COMIC RiN 2010-10) [MrBubbles]

A curvy, bespectacled professor invites her young assistant to help with a very hands-on experiment, and it soon becomes clear one assistant was never going to be enough as a second boy steps up to claim her from the other end. What begins as 'just taking some data' escalates into sweat-drenched paizuri, deepthroat, and relentless anal and double penetration, with x-ray panels revealing just how deep the research goes as she begs to be filled. By the final page the once-composed genius is a drooling, cum-glazed wreck proudly declaring her body her assistants' exclusive property, eager for 'triple research' whenever they please.