The first gal that spike have to fuck, might be twilight, cuz he's been livin with her for his entire life... And I like that idea ( ?°?????° )
Edit : Changed Twilight head size, added spike icon, changed Spike color saturation, adjust a bit of Twilight's arm
Edit 2 : some coloring error on her left arm, now its fixed ( Sorry for the spam)
Edit 3 : Holy shit i've never been this sloppy before for some fucking reason, her right arm error color and the facial lineart color has been fixed, omg what i've done!