20 reps

Felicity goes to put on more weights on the bar and you look at it a little unsure: "100s kind of a lot for 20 reps, wouldn't you say? I've only done 10 and that was last time on wednesday." You laugh nervously and get under the weight bar and feel it – it's fucking heavy. "Pff, you didn't even break a sweat then. You told me it was nothing, come on. I will give you a reward if you do it." Felicity says and sits on a bench and smirks at you. "What reward? Dude, this is sketchy as fuck. And these pants don't stretch for shit..." You feel your tight pants and fear they will rip. "Take them off then! Sheesh! What's wrong? You never bitch in the gym. Come on!" Felicity says like the bully she is and you push your pants off and check that no one's watching. You usually wear mens boxers because girls' underwear are **** for your cock most of the time. Now though you really wanted to promote your ass, so you went for a thong, so it's quite bad.

"Shit. You are demanding... Gonna stare at my ass the whole time, huh?" You lift the weights and already clench your jaw as you do the first rep. "Of course. I gotta see that you do it proper. Come on, lower that ass!" Felicity teases you and you keep doing reps and feel your legs shake after the 11th. "Oh fuck... my legs hurt..." You say and look at her in pain and breaking a sweat. "I count 11. You can't do more? Lower your ass girl." Felicity says like the little bitch she is and you laugh dryly and do a couple more and start tasting bitter in your mouth.

You do more, slowly and surely and at 18 you start feeling lightheaded and whine: "I can't... phew, huh, huh... I am going to p-puke..." Felicity gets up and behind you. She presses on your back and holds the weights with you and you shut up. She guides you down and then back up again, your legs shaking and about to give out any second now. "Come on, one more." She helps you do the last one and you put the weights on the rack and fall down shaking. "Hm... oh fuck... ah..." You pant as you see white. Your throat is dry and everything hurts - you should've stopped at 10 again, stupid to even try doubling your previous record in three days. "Hey, Mari. You ok?" Felicity gets over you and lifts you on your ass and it hurts: "My... ah fuck... ah my ass..." You look at her wincing and hardly feel your legs. Your dick is hard though and you have no idea why.

"Oh my god, you are such a mess, big girl. I'll go grab some water. Hang on." She runs off and you look at your boner and then remember Felicity's soft tits on your back just now and get a dumb smile and look at your throbbing cock leaving a wet stain on your underwear. "F-fucking great... oh my god..." You mutter and try to massage your legs which are still shaking and numb. Felicity hurries back with a plastic cup of water and makes you drink it. "Damn, sorry. You feeling any better?" She asks and you point at your dick and shake your head: "I won't even hide it, shit..." You smirk and she looks at you with that big sister look she has: "I can't believe you, Mari. Ha..." She shakes her head and gets up. She sits down on a yoga mat and starts stretching while you finally get up and wobble over to her. You sit down before her and start stretching too.

"Oh... ah... hmm..." Your legs are so stiff and you don't even notice as you try to get your limbs back in shape what noises you make. Felicity stops and looks at you squinting her eyes: "Hey! Mari. You need help?" Her sudden serious tone makes you stop and look at her a little unsure. "What?" You get a blush on your face and she seems to be thinking about something and clears her throat: "I mean, I can take your leg if you want to stretch that way." You do that and she hold you as you stretch and it feels good again: "Aahhh... ah... oh fuck me... why did you make me do thaaaat, aaah!" You whine and Felicity stares at you and you switch legs.

After that you start feeling your legs again with blood flowing to them and it too feels good and you lay down feeling amazing: "Ahahaha! That's so good... ahh... thanks Liz... oh yeah... I'm so hard, what the fuck? Ahhh..." You peek at her and see that she's thoughtful and you wonder why again but don't have it in you to ask directly: "Thanks." You smile at her and she smiles back and continues stretching as much as she can in that gingerbread dress. You feel a strong sense that the atmosphere has changed and wonder what it could mean.