A silly game with my sister

Hi everyone. Let me introduce myself. I’m abhay and I am 24 years old boy. My sister pratyusha is younger than me. She is a 21 years old nerdy average girl. She wears specs. She has medium size of
boobs. A bit chubby on her lower side. And a heart-shaped ass. She usually wears t-shirts and track pants at home. We both live with our mom and dad.

It all started a couple of years ago, we were playing our own made up game called "the devil's game". I was the devil in that game and my sister was the victim. As usual I was chasing my sister around the house. I had to catch her and then tickle her until she started begging for mercy. We had played this game many times. We played this game on most of the weekends. On this weekend my mom and dad had gone out for their own work, we were alone in the house. Me and my sister started playing the game. As soon as I started to chase her around the house, she was trying to save herself and I was getting closer to catch her.
she ran towards guest room and she tried to lock the door from inside. I ran behind her and I was trying to open the door, she was holding it from inside and trying to push it towards me. We were both laughing as it was just a game. I started to push the door and finally I managed to open it and I got inside her room. She was still trying to run away while laughing. I grabbed her from the waist. I lifted her in the air and she started to giggle and laugh. I took her near the bed and dropped her on the bed. She was laughing and giggling. She was wearing a pink t-shirt and track pants. I held her hands above her head and started to tickle her on her belly and her armpits. She started to laugh and beg me to leave her. But I was on top of her and I had her hands locked.

But all of a sudden she squeezed her eyes shut and her face turned red. I was still pinning her down when I felt my boner brushing against her crotch. It was just a game, I was just playing with her. But now things are out of my control.

I wanted to get up and run back to my room but instead I rested my body on top of her and started to rub my lips on her cheek and on her neck. She kept her eyes closed and she was breathing heavily. Her boobs were pressing against my chest and my boner was pressed against her crotch through our pants. She was just lying there, not resisting at all.

I kept on running my lips from her cheek down to her neck and then back again to her cheek. I hesitated first then i tried to kiss her on lips. But whenever i tried to kiss her, she turned her head sideways, not letting the kiss to happen. Although I was able to brush my lips with her lips quite a few times. She was breathing heavily. I knew she was innocent but she was also enjoying this too. I didn't realise when I started stroking my boner between her legs.

I was grinding her when I notice that her mouth was slightly open. So I took the chance and kissed her on the lips. This time she didn't turn her head sideways. I kissed her lightly and then again more passionately. I slowly opened her mouth with my tongue and I pushed my tongue inside her mouth.

After some time mom came at home from market. My sister was lying on her back with her mouth open. I was on top of my sister, with my tongue in her mouth. I stopped and I pulled myself back. I pulled up my track pants and I ran to my room. She didn't say a word. She just stood up from the bed and walked away from the room.

I was still hard and I was breathing heavily. I tried to calm down myself and I took off my track pants, I took out my cock and I started to masturbate. I imagine what i had just done to my sister. I masturbate while imagining her on top of me riding my cock. Then I went to for the dinner.

As usual I acted normally with her and mom. She also acted like nothing had happened between us. We didn’t talk about anything that happened between us. But I knew I have to finish what i started.