Step mom couldn’t resist her first anal sex after gaining weight, and she didn’t even try to hide it once Dad left for his work trip. She’d filled out over the past year softer through the hips, heavier in the ass and the thin shorts she wore around the house made it obvious. That night she came out of the shower in one of his old T-shirts that barely reached the tops of her thighs. She sat on the edge of the couch next to me, quiet for a minute, then turned and said it straight. “I’ve never done it before. But I can’t stop thinking about you fucking my ass.” She stood up, bent over the arm of the couch, and pulled the shirt up. Her ass was fuller now, soft and round. She reached back and spread herself open. I could see she was already wet. The lube was waiting on the table. I coated my fingers and worked one into her tight hole, slow and careful. She pushed back with a shaky breath, the extra weight of her making her sink deeper onto my hand. A second finger followed once she relaxed. I moved them in and out, stretching her, listening to the soft sounds she made. When she was ready I stood behind her, slicked my cock, and pressed the head against her. She held herself wider and told me not to stop. I pushed in inch by inch. She was incredibly tight at first. A low moan left her as I sank deeper until my hips met the soft give of her ass. Everything felt fuller and warmer because of the weight she’d gained. I started with long, slow thrusts, pulling almost all the way out before driving back in. Her ass bounced with every stroke. She braced on the couch and pushed back to meet me. One hand gripped her hip while the other reached under to rub her clit. She got louder. The wet sound of the lube and the slap of my hips against her filled the room. Her thighs started to shake. “Harder,” she said. “I can take it.” I gave it to her deeper, steadier strokes that rocked her forward. She came first, clenching hard around me, a long shaky moan spilling out while I kept moving. The tight pulses pulled me over a minute later. I stayed buried and came deep inside her ass, hips pressed tight against the soft curve of her until I finished. I eased out slowly. She stayed bent over for a moment, breathing hard, then straightened and pulled the shirt back down. Her legs were unsteady. She looked at me, face flushed. “Don’t tell your dad,” she said. “And don’t think this was the only time.” She walked toward the bathroom, the hem of the shirt swaying over her fuller hips, and I sat back on the couch still feeling the heat of her around me.