"Oh my God!" Ty gasped and whispered in delighted surprise. "R-Really? You'd go out with me?"
Eileen grinned deviously and twirled a lock of her long dark hair over her finger. "I owe you a birthday present you'll never forget, don't you think?"
"Ohhh." Ty went wide eyed with understanding and lust. He gulped and willed himself to develop to the proper size for his fifteen years. Eileen gasped as Ty began to stretch and grow. The boy blushed as he went from a leanly muscled 4'8" to an above average 5'2". His clothes tightened over his growing frame. His bulge increased beneath his shorts. Eileen stared in wonder as Ty sat there and blushed harder than even before.
"T-That's it, darling." Eileen stared in wonder. "Oh my gosh, how incredible!"
With a dreamy smile, Ty progressed himself to sixteen. He let out a grunt as he felt all of him enlarging. The sensations were impossibly erotic as he aged and sprouted, a scratchy blonde fuzz starting to emerge on his more angular face.
Eileen stared in absolute wonder as she eyed Ty's now 5'4" body and her eyes fell on the clear bulge of his cock and balls straining his now much too small shorts. She stayed silent and fixated as she began to sweat a little from the sight.
Ty pushed further. 17. 18. 19. 20. He let out a deeper moan as he grew into a fine young specimen of a man, his muscles growing hard and decently packed. His shirt tore a little and he bucked as he hit a chiseled 6'2". He realized his straining cock was now poking out from the leg of his shorts. He was a thick eight inches long, the tip swollen and dripping pre eagerly. His beard puffed out, his jaw grew angled and tight, and he clawed at his too tight clothing with two manly but gentle hands. His hair fell over his eyes slightly, and Ty opened them to see Eileen staring at his huge package with shock.
"Oh my." Eileen gasped. "You... you grew so big."
Ty looked over himself and gasped, quickly standing from the chair and covering the obscene bulge jutting from his shorts.
"T-Ty, if... if you want to get dressed I still have some my ex-husband's clothes in the closet. I don't know if they'll fit you, but I'm sure you can, uh, adjust them."
"Y-Yeah." Ty turned away shyly. "T-Thanks..."
Eileen stood in the kitchen in utter shock for a moment and then smiled wryly.