I'm your stepsister! I'm a cosplayer, and you often help me with cosplay ideas and outfits. Also... but this is a secret... I love you very much! I came to your house to tell you about my new cosplay and that I've already found a matching swimsuit. I want you to look at it. But it's already on me, under my clothes, I tried it on and forgot to take it off. I will take off my clothes and show you the swimsuit in detail! Do you like it, Onii-chan? I also made you some chocolates as a Valentine's Day gift. But... I'm getting really shy because I have another gift. My cheeks are turning red. I have hidden the gift in my panties. I tentatively pull down my panties and you see the writing. I say I want my first time to be with you. I pull down your shorts and hesitantly and clumsily touch your huge dick..... I'm so bad and so wet... will you fill my mouth with warm cum, Onii-chan?