She takes what she wants

"But...but I'm not gay," you say in protest.

"Baby, the way you were craving cock earlier, you are as gay as can be," Kelsi said. "You just didn't know it until I fed you mine, just like you didn't know you were into taking it up the as until-"

With that she gave a sudden, hard push and your tight virgin asshole opened for the head of her giant cock. There was pain as your hole stretched further than it ever had before, but not nearly as much as one would have thought.

"It'll only hurt for a minute," Kelsi whispered to you.

In your younger days you'd talked a few unwilling girls into giving up their asses to you, including Kelly. She wouldn't even let you lick her backdoor now, but when you were dating, you had ass fucked her several times. You'd had no idea how it made you feel. Bent over with just the head of Kelsi's cock inside you, you felt completely helpless and submissive. It was hard to believe your wife ever let herself feel that way.

"You are so fucking tight," Kelsi said as she rubbed your neck. "But we'll fix that tonight. I should warn you, your ass will never be the same."

You heard Kelsi spitting, then felt warm wetness in your ass crack. She gave another hard push and slid deeper into you. You buried your face on the mattress as you yelled out in pain.

"Shit, you're a screamer?" she asked. "You'd better grab a pillow unless you want my mom and dad to hear you losing your virginity."

You reached out for a pillow, which brought a new sensation as you tried to move with part of a massive cock buried in your ass. You bit your lip to quiet a moan, this time one of pleasure. You couldn't believe, even with your asshole being torn in half, you could still feel pleasure.

You grabbed a pillow and buried your face in it. At once your senses were filled with the very feminine scent of Kelsi's shampoo. It was a comforting smell.

You fought back another scream of pain as she gave it another hard push, this time forcing her big cock all the way into your asshole. The pain in your asshole was sharp and you were sure she had torn something. Then she leaned down on top of you and kissed you on the neck.

"The worst is over, Uncle Jason," she whispered in your ear. "We'll stay like this for a minute while you get used to it."

She turned your head to the side, then kissed you passionately on the lips. The pain didn't go away, but as you stayed in that position, your backdoor seemed to adjust to having something in it.

"I think you're ready," Kelsi said very softly, and with that she started fucking your ass.

Each thrust in and out brought new pain. It felt like each inward thrust was burying her big cock in your stomach. But, each time she was all the way in, it's like she got a secret button somewhere inside of you. You had to moan into the pillow in surprising pleasure.

"Fuck your pussy is so tight, I'm not gonna last long," she said. "But we'll fix that. After a few times we'll be able to fuck all night long and you'll be having one big prostate orgasm after another."

You had heard the term prostate massage before, but you'd never looked any further into it than that. You were still contemplating exactly what that was when you unexpectedly climaxed. It was not like the big, explosive orgasm you got from jacking off, but a slow and steady orgasm that left cum oozing out of your cock.

"Cum for my big cock, Uncle Jason," Kelsi said. "Show me how much you love being my bottom slut."

All you could do was moan and leak cum all over her mattress. After what seemed like one long, pleasurable eternity, Kelsi blew her load inside of your ass. Then she eased you up into the bed and lay down with her arms wrapped around you.

Suddenly completely drained, you slept.