"Mmm..." he mumbled quietly as felt the cool sheets on his body. Bart relaxed his muscles and simply lay there for the longest time. On impulse, he reached down to adjust himself through his white briefs. As his hand grasped the bump in his shorts, a thought occurred to him; "Ya know, I don't even have to have these on..." And with that, he plunged his thumbs inside his waistband and peeled the cotton underwear off his frame.
"Yeah... That's better." he thought as he rubbed his soft, round butt against the sheets. He stretched himself out and again released the tension in his muscles, now and then absent-mindedly reaching over to rub his foreskin or pet his scrotum.
After a time however, Bart was pulled from his relaxation by the shrill note of his baby sister crying.
"Damn!" he thought, releasing his penis and beginning to look for his underwear. "Wait a sec... It's just me and Maggie, and she's just a baby, I don't have to get dressed." he said to himself, scooting his bare bottom off the bed. Quickly he made his way across the house to the playroom.
He found his sister standing up in her crib, pouting. "What's your problem, man?" Bart asked her. Maggie reached out beyond the rails of her crib. "Oh, you want out, do you? Well, all right." he told her.