Ben 10 – Sultry Summer by Incognitymous
Friend visitor and partner of Adult Free Comix, Ben10’s grandfather needs to go out on a date, leaving him and Gwen alone in the trailer. Gwen then starts watching porn videos, and masturbating underneath the sheets, so Ben does not see. Even so, shortly afterwards he catches her in the act. Now, the cousins are going to enjoy the time alone, together, to discover some new things.