Bill makes Heather more aroused

The same slack expression appeared on Heather’s face. She began to drool slightly as her eyelids grew heavier.

“Heather, you don’t have to be ashamed of your butt. It is magnificent. Now your ass is an erogenous zone. Anytime something other than clothing touches your ass you find yourself aroused. The closer the item is to your asshole, the more aroused you are. And when your ass claps you can’t help but leak a little from your pussy. In fact, when you dance your victory dance, you’ll purposely make it clap. Throughout the week you will find yourself getting more and more turned on by the thought of your ass. And when you catch me staring at it, it excites you, even if you won’t flat out admit it yet. By Friday, you won’t be able to contain yourself. You will make another bet with me where the loser has to be spanked and when you are you will have a mini orgasm. You will then go masturbate furiously. When you’ve cum you’ll come back out and play games with me.”

“Ewww was I drooling. Sorry… I mean. You… spank pretty hard…” It was interesting to see Heather so awkward as she wiped the drool from her lips and came back to reality.

“Not that… I… like that… just… ehem. Anyway, it’s time for bed right?”

“Yeah probably.” Bill said and he watched her get up and stagger to bed. She turned around and caught him staring at her jiggling ass and suddenly she turned red.

“Pervert.” She said, but she smiled and even hiked her pajama bottoms up once causing her massive cheeks to bounce.

As soon as her door closed, Bill pulled out his dick and masturbated to the memory of spanking her and that bounce. He couldn’t wait for the next week to play out.

That weekend Bill noticed the app took effect quicker than the prior two uses. Whenever Heather would catch him staring at her ass she would hike up whatever pants she was wearing. Sometimes she’d say “pervert” in a playful way and sometimes she wouldn’t. The competitive streak was becoming routine and Bill found often times, he would let Heather win just to watch her victory dance.

It started with her just dancing. Then she would spin around and jump allowing Bill to both hear her cheeks clap and watch her gargantuan booty bounce.

By Monday, Heather would start to take longer changing into her pajamas after they would eat dinner and Bill swore he heard moaning from in there.

Something Bill had not anticipated was Heather worked out at home now. But more than that, most of her workouts were in the living room, and often times, they were yoga. By Wednesday, Bill finally understood, she was getting off on him watching her work out and then going and masturbating to the thought of him staring at her ass.

Thursday, Heather went to work and Bill sneaked into her room. It reeked of sex and Bill immediately dove into her laundry bin. Her last pair of panties were still sopping wet.

“Fuck how much does she masturbate.” He said aloud as he inhaled her juices scent. Fuck she smelled so good. He couldn’t wait until Friday.

Friday came and after work Heather got dressed into her yoga pants and sports bra and began to do yoga in the living room. Bill did his best to stare only occasionally.

“You know… if you stare at it so much you must really like it.”

Bill snapped out of his day dream. “What?”

“My ass. I know you’ve been staring at it all week. You are such a dirty pervert. But… it does make me feel good. I don’t know what happened, I used to be so self conscious about the size of my butt… but… Recently… I don’t know. It just makes me feel good that someone out there thinks it’s kinda… sexy.”

Heather was in downward dog now looking at Bill upside down from between her legs. Bill looked at her at a loss for words.

Finally, he stuttered out, “I mean… it is a sexy butt.”

“Anyway, what are we gonna play this time? I want the same stakes as last time. I’m gonna spank you harder than you spanked me.”

"I don't know, last time I spanked you pretty hard. Both inside and outside the game.” Bill teased.

"Yeah and this time I'll spank you." She said, but her face gave away her intentions. She wanted to lose.

“Sure, when you’re done working out we can play. Same game?”

“Yep. I’ve gotten better.” And with that Heather stopped her yoga and went to go change into her pjs.

The match started and it was clear the fat bottomed girl wasn’t trying hard. Bill two matches in a row before he started to talk smack.

“Wow I thought you got better. Didn’t you say something about spanking me so hard?”

“Shut up. I’m trying. You are just better than me.” Heather said.

Holy shit was that a wet spot on her crotch. Bill lost the next match because he was staring. He couldn’t believe it, Heather was getting wet with anticipation of getting spanked.

“Hey, you keep staring at me and I’m gonna spank you faster than you thought.” Heather said laughing.

“Oh. Trying to distract me with your body I see. Next thing I know you’ll be flashing me.” Bill said trying to be silly.

“In your dreams pervert.” Heather said as she lost the next round.

“One more round and I’ll spank your ass again!” Bill said.

Heather began to shift in her seat. Clearly uncomfortable and clearly aroused. In fact, her nipples were definitely hard. They were poking into her navy blue fleece tank top out almost an inch and they were thick too.

Shit he didn’t realize she had such big nipples.

“Ha I beat you again. Maybe I should flash you, I’d win so fast. Man you are such a pervert.” Bill had grown used to the insult and knew she was using it playfully. He also could hear the pleading in her voice. She didn’t want to win. But her previous trigger made her competitive enough where she wouldn’t just let him win.

“Oh yeah. Double or nothing says I win this one.”

“Double or nothing huh?” Heather raised an eyebrow.

“Yeah. Winner gets to spank the loser 6 times.”

“S… six… t… times.”

Bill could practically hear the juices flow into her panties as she stuttered out the words.

“Yep. You don’t even need to win the next two. Just this next match. If you win. You spank me 6 times. If I win. I get to spank your big fat ass.”

Heather rubbed her thighs together. “Okay.”

If she had any competitive nature left in her. It failed to combat how horny she was getting. Heather lost the match so quickly it surprised even Bill.

Before he could even tell her to, she was bending over his knee and pushing her butt up slightly. The fuzzy fabric of her pjs slipping in between her cheeks slightly.

“Oh really? That eager to get this big butt spanked?” Bill said and placed a hand on her right butt cheek.

He heard her hiss in breath. “No. Just wanna get it over with. Just… be gentle.”

It was a mix between a plea and her egging him on to hit her harder.

"Alright, don't say I didn't warn you about how hard I’m gonna spank you this time ." Bill's hand came down hard and he watched her ass jiggle. He could also feel two other things he did not anticipate. He felt her actual pussy lips tighten on his thigh, and he felt a small wet patch form.

“Owwwww fuck.” Heather gasped.

Bill’s hand went up and came down 5 more times and each time he swore he felt her cum.

"Okay, are we done." She said hopping up.

"I uh..... guess." Bill said looking down at her crotch where sure enough a wet spot had formed about as big around as a half dollar.

“Okay goodnight.” Heather turned and ran back to her bedroom.

Bill looked at his jeans and saw a small wet spot there too. Casting a side glance at his roommate's closed door. He wiped at the spot with his finger and put it in his mouth. Fuck she tasted good.

That's when he heard the definite moaning reach a crescendo.

Five minutes later, a very dishevelled looking Heather opened her door, quietly came out, and sat on the couch with Bill. “What’s for dinner.” She said out of breath.