Ty decided to give Mark what he wanted, but not completely. He internally wishes for his underwear to become a thong and a bra, while his facial features become more feminine for a 15 year old boy. Without Mark knowing what was going on with Ty, the teen boy rubs his hands on his foster dad's lap, letting out a very cute giggle.
"I can still be your princess, daddy~" Ty makes the older man finally look at him, catching Mark completely off-guard by his sudden change of appearance. Ty takes off his shirt to reveal his feminine looking body, showing off his tiny bra that was covering his nipples. "My boy pussy is moist enough for your big cock.."
"You look so cute.." Was all Mark could say, his hand placing itself on Ty's chest. The teen boy lets out a very cute moan, and Mark becomes more aroused than every in his entire life. "Care to make daddy feel better, my little princess?"
"Anything for you, daddy." Ty leans in and makes out with Mark, while taking off the rest of his own clothing. Mark deeply enjoys the kiss, pushing his tongue into his foster-son's mouth while his own hands would slide off his pants to spring out his 8 inch hard cock. The sissy boy's eyes grew wide when eyeing that big rod, breaking the kiss and moving down to immediately start blowing his father. Ty worked the head and shaft very well, as if he's been doing this for years.
"O-oohh sweetie.." Mark groans, doing his best to keep his voice down so June doesn't hear them. He looks Ty over and admires how cute and sexy his son looks, wishing he would've looked at him a bit more when they first adopted the boy. "You make daddy feel so much better.."
"Mmmm I love you, daddy~" Ty pops his father's cock from his lips and drools on it while stroking the base. "I want daddy's cock thrusting my tiny boi pussy.."
"We can't do it here, princess.." Mark whispers to the teen, his finger sliding between the 15 year old's thick ass to feel that moist pucker. "June or Dustin will hear us.."
"We can get out of the house and go somewhere more private." Ty suggests, knowing that going outside will be very easy to control Mark once his lusts goes beyond his full control. The father ponders for a short moment, all while his sissy son licks and teases his cock.