A picture from a story about Dana and his big sister, Dena, that I never finished (or even got to this part).  This is when they're taking a break of cross-dressing Dana in his sister's old clothes, when they both get worked up and just start humping, without taking the skirt off Dana.  The pic wasn't quite up to my standards at the time I drew it, and I accidentally made Dana's body way too small :p  It's still a fun pic tho :)