Sylveon was at home watching her little brother while their parents ere away for a few days. Sylveon was on the couch watching tv when she suddenly felt horny blushing she walks into the bathroom to masturbate. Unfortunatly that wasnt enough and mind couded in lust decided her brother who just came of age is a suitable partner. She walks to his room asking if he wants to play a special game. Her brother eevee asks what kind of game. To wich sylveon without saying a word lifts her shirt off and pulls her pants down leaving her in her underwear. An adult game she says smiling. Eevee blushes at the sight of his sister. Hes always found her atractive but represed those feeling because they are siblings. She giggles seeing him trying to hide his erection. Sylveon tells him to strip as well ash she unhooks her bra showing him her modest C cup breasts and pulling down her panties leaving her fully naked. Eevee nurvously undresess once fully naked he sints on his bed staring at his sister. Sylveon gasps when she sees his member. It was bigger than any shes any shes seen before. Wanting to feel it inside her she climbs onto his lap and slowly lowers herself onto it. Inch by inch she pushes it deeper in until it reaches her cervix. Eevee pants from the tightness struggling to not cum. Sylveon slowly lifts herself op and drops back down speeding up each time. While watching her bounce on his length eevee grabs onto her breasts and fondles them making her moan. Sylveon gasps when she feels him latch onto one of her nipples and start sucking. She smiles at how cute he looks doing that and pulls him in into her breasts. Feeling his knot growing sylveon tries to get off of him. Only for eevee to grab her hips and slam her down pushing his knot into her. The added depth pushes him into her womb where hits his peek. Sylveon shudders as him cumming in her womb sets her off as well. She looks at him angry but sees hes fallen asleep exhausted from his first orgasm. Sighing sylveon admits he was the best shes ever had and that shes lucky her heat isnt until next week. What she didnt know was her heat started early which is why she felt horny all of a sudden. And deep within her womb his seed already found her eggs and quickly fertilized them. During the night multiple lives were growing inside of her ahd her.