A full hentai vagina.
Note, between the last page and this page, there are THREE ADDITIONAL PAGES in the XXX-panded issue available at Drive-Thru Comics. As a result of the those three pages, Libby’s dialogue in the first panel is slightly different than the XXX-panded version.

Comic Dialogue
(If you have Wii Gloves for you wee little fingers it’s also electronic Braille.)

Libby Belle: “You’re barely in! thrust that cock all the way in!!”
Libby Belle:DEEPER!
Lobo the Half Giant: “DAMMIT! It’s too damn tight!”
Libby Belle:DEEPER!
Lobo the Half Giant: “Fine…EAT TREE!!
Lobo’s Other Brain THROMPs into Libby’s Lovebox.
Libby Belle: “Okay. It’s in.”