Incentivizing Good Grades

My hot stepmom's been getting those calls from school about my slipping grades. I should probably give a shit. Instead I'm thinking about pussy like any other guy who just wants to get laid in college. She knows exactly what she's doing - prancing around with those fat tits bouncing, giving me that look. So I go for it, hands out, and she slaps my face so hard my ears ring. Funny how that only makes me want it more. She tries bargaining. Hit the books, she says, and maybe I'll see more. An hour in and my head's swimming with equations. I drag my sorry ass back to her and there it is - that perfect ass bent over right in my face. I reach out and she swats my hand away again. Still just the tease. Three hours of actual studying later and she's finally on her knees with my cock down her throat, working it like she means it. I flip her around and start slamming that MILF pussy from behind while her heavy tits slap together like they were practicing Newton's laws. My brain's making physics connections mid-fuck and I don't know whether to be horrified or impressed. I keep driving into her until she's cumming hard on my cock, legs shaking, then pull out and paint her ass with everything I've got. Yeah, I'm passing this semester.