[MF] I (28M) finally did it with my girlfriend’s (24F) sister (18F)

Part 1: https://www.reddit.com/r/gonewildstories/comments/12n4smk/mf_i_28m_am_going_to_cheat_with_my_girlfriends/?utm_source=share&utm_medium=ios_app&utm_name=ioscss&utm_content=2&utm_term=1

The next week, my girlfriend had to work on a Saturday. I got out of work early at 10am (I take shifts on Saturdays), and she texted me I can stay at her house until she gets home in the afternoon.

I texted my girlfriend’s sister saying I’m coming over. She texted me asking can I get her favorite snack from the coffee place. Obviously, since I was on the watch I’ll get it for her.

I got her house, and she opened the door. My mouth dropped. She was wearing a lacy bra being covered with a see through long sleeve white shirt. She had lacy red underwear.

“You like what you see,” she asked sultry-like

My dick got so hard. I can only do a nod. I dropped everything and we kissed. I pushed her against the wall and forcefully made out with her. I slipped my tongue in to which she reciprocated back. I picked her up while carrying her into her room, continuing to lock lips with each other.

[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.