The temptation of Viagra leads this horny brother to his sister's bedroom, where he finds her sleeping in her tiny, innocent panties. He can't resist the allure of her young, untouched body. He wakes her, his rock-hard cock already aching for her tight pussy. She's nervous but curious, her fingers tracing the veins on his throbbing shaft. He guides her head down, encouraging her to suck him, and she does, her inexperienced mouth struggling to take his length. He fucks her face, his balls heavy with cum, before flipping her over and sliding into her from behind. She gasps, her small body tensing as she feels his massive cock stretching her virgin pussy. They fuck slowly, the room filled with their soft moans and the wet sound of their bodies coming together. He reaches around, his fingers finding her clit, and she comes undone, her body convulsing as she orgasm for the first time. He pulls out, his cock glistening with their combined juices, and she looks back at him, her eyes filled with a mix of fear and excitement. "Cum in my mouth," she whispers, and he does, his hot load filling her mouth as she swallows every drop.