As Mark came into Ty, Ty acidentally thought about having the cum grow them As the semen was absorbed through their pores, btoh Ty and Mark gained muscle and were revitalized. Of course, Mark was still bigger.
"Oh, Mark, your cock is so huge." Before Mark knew what happened next, Ty had thrust his cock into Mark's. Mark screamed in orgasmic delight.
"Yeah, fuck that fucker--OOOOOOOOOOOH!" As Ty thrusted into Mark's urethra, it began to swallow Ty as a torrent of cum crashed into him.