[MF] I (28M) am going to cheat with my girlfriend’s (24F) sister (18F)

A little backstory: I’ve been with my girlfriend for two years now. We’re very happy, and her whole family likes me as well. At first, her sister was a little shy around me; but, after I started talking to her more, she started to get more comfortable with me. Every time I visit my girlfriend, I would occasionally spark up a conversation, which’s he seemed really happy about. Whenever she seemed upset, I always asked if she’s okay and if she wants to talk.

Over the past year, I have caught her staring at me more. I would ask if something is wrong, to which she would swiftly reply “nothing is wrong.”
Our hugs have been increasing in duration.

The last time, I hugged her we both looked deeply in each other’s eyes.

“My sister is so lucky,” she says.
I questioned what does she mean. She goes on to say how smart, strong, and attractive I am. She also goes on to say she wishes she was older so she has more of a chance.

Yesterday, I went to drop off a tool I borrowed from their dad at their house. The sister was home alone, since she had early release.
When she opened the door, she readily welcomed me. I put the tool down and hugged her. This time it was different. She looked at my eyes. And I knew what she wanted.

“Can you be my first kiss,” she asked. I kissed her gentle soft lips and caressed her face. Her lips were amazing that I immediately got turned on. I pushed her to couch and laid on top of her.

Our kiss sooner included tongue. Her tongue was minty, as she just brushed her teeth. She then moved her hands from my chest towards my groin area, immediately making me so hard. I’ve always thought her and her sister was hot. She kept rubbing the outside of my pants, and I just kept getting harder. She was taking off my pants, saying how bad she wants to put her mouth on me.

Our fun ended when her mom FaceTimed her. So I decided to leave. She gave me a hug and a kiss, and she said don’t forget about me.

I’m so turned on by my girlfriend’s sister. I’m coming back for more.

Source: reddit.com/r/gonewildstories/comments/12n4smk/mf_i_28m_am_going_to_cheat_with_my_girlfriends