How does things go from now?

Testing the water

A few weeks later, Carrie paid a visit to her family for the weekend. As soon as she arrived, you received a text with a picture of her hugging a smiling Cassidy and kissing her on the cheek, togheter with a " ;) " emote. It was the beginning of a long thread of enjoyable mission reports. Half an hour later you were tagged on one of her social media posts. " My dad as reconverted my old bedroom into a home office room, so tonight I sleep with my little sister. Don't be jealous sweetie, I couldn't resist those eyes ;) " accompanied by a high-angle shot of both girls lying on a bed, apparently laughing. You appreciated that your girlfriend took care of getting both her busts into the frame, though they were fully clothed. A few hours later, it was a selfie of Carrie in front of a mirror, wearing nothing but a loose tank top and a black slim thong, Cassidy hugging her from behind with her chin resting on her shoulder. " Ooops, forgot my PJ before going to see the family. Guess I will have to do with what I brought. "

It was past midnight and you were busy wanking at the thought of your girlfriend fucking her little sister in various ways, when you got a new private message.

Her: Hello! She's finally asleep. The day has been so good, but now I'm horny as hell. I can't wait for the time I win your challenge :p

Her: Liked my pics?

You: loved them! was thinking about them, if U want to know

Her: Perv.

You: guilty! U made me this way

Her: lol, like I would have made you my man if you weren't already a perv :p

You: fair... U did anyting with the lil sis?

Her: Not really, except I droped the shirt after last picture. Pretended it was scratchy and feeling too hot. She looked interested by what she saw x)

You: she touched?

Her: No, but maybe she'd like. Tomorrow maybe ;)

You: other plans?

Her: Shopping maybe. I'll try to convince her to slutten up her dress code :p

You: nice, send pics

You: you kno wat kind ;)

Her: Like you need to tell x)

You: hey, maybe you should truth or dare her

Her: Good idea! Nothing too sexual for the dares unless she's ready, but I will gather max infos.

Her: Anyway, I'm gonna sleep. Miss you and your dick :3

You: yeah, we miss you 2

The next day, you woke up to a text with a picture taken from behind through a doorway of an unsuspecting Cassidy drying her hair after a shower, with her lovely little ass in boxers. In the afternoon, it was followed by an entire photoshoot on social medias of both girls trying various outfits in stores. You couldn't help but notice the clothes became gradually less covering as time passed. The little sister looked like she was both uneasy and enjoying herself. By the end of the day, they had moved to swimsuits -which helped you confirm the younger brunette didn't have much to envy from her elder in the upper region.A few minutes after they stopped flooding their accounts, you received another private message with the text " Just for you ;p ". Both girls were standing side by side in a changing room, turning their backs to a mirror. They were both wearing only bikini bottoms. Cassidy was blushing and covering her giggles with one hand, and her chest with the other one even though nobody could see her front. Carrie was sticking her tongue in a provocative way, the hand she didn't use to hold her phone resting on her sister's lower back. " love it, U're both beautiful " you answered.

Later again, you had another midnight conversation.

Her: Ohmygodohmygodohmygod!

Her: You remember we talked about truth or dare yesterday?

Her: Well, I've leartn a lot!

Her: The most important part: My baby sister is still a virgin! She never went past kissing and I'm not even sure it was the french kind çwç

Her: Now it's not just about the challenge and your fantasy, it is my DUTY to turn my little Cass into a slut.

Her: Our slut of course ;3

You: wow!

Her: But seriously, how can she be 21 old and still virgin?

Her: Maybe we're not related after all? I hope not, this **** idea is becoming hotter and hotter in my mind x3

You: U learn anything else interesting?

Her: Hum... Yeah, she admitted she may swing both ways. She had a crush from one of our highschool female teachers ;)