Accidently sexting your Trans Big Sister

Sinéad and you have a bit of a weekly ritual. It started about a year ago as you were both lying in bed, you sent her a message and asked if he was up and he replied. Every Thursday night without fail, not long after we would both retire to our bedrooms we would send each other silly messages. Sometimes memes, sometimes silly face pictures, sometimes we would get into something deep an meaningful. Tonight was just a normal kind of night, memes and a little chat, the only thing was you were also chatting with you current fuck buddy Rachel. You would hear your phone ping and it would be a sexual conversation with her, and then each other message was a pretty wholesome back and forth with your Sister. That was until you got your wires crossed.

Yeah he was fucking blitzed. Rolling around the floor in his own vomit. Had to get the bouncer to eject his ass. She said talking about the other night at her bar job. 'That sounds fucked, you ever think of getting another job?' I replied, the messages with Rachel beginning to heat up.

I mean, yeah but hard for someone like me to get work you know.

'don't sell yourself short sis. You are a hard worker and fun to be around. Someone is going to see the potential in you and jump on hiring you.'

Thanks bro, you are very sweet for a little shit :p But I don't know maybe... Wish they could see the potential you see in me. he replied pouring his heart out. Just then I got a message from Fiona, flashing me the underside of her boob. I pulled down my pants and took a photo of my erection straining against my underwear, the outline clear and suggestive. I hit send but seconds later only realising I sent it to the wrong person... it was too late. Sinéad was looking at her phone as the message chimed, she didn't expect a multimedia message from me but gathered I was sending him something nice or heartfelt. He opened it up and was confronted with a picture of my hard cock, straining in my jocks. She laughed to herself for a second but stared at it for the longest time. She knew it was a picture of my cock because the room was definitely mine and the proportions of my body were correct. She didn't know what to do but she couldn't look away. Oh my god he whispered to herself. Why did he send this? We were just having a heart to heart and then this. It was a weird shift of gears for her but... She kept looking at it and it was doing things to her that she knew it shouldn't, she was beginning to stir inside and her cock was beginning to become hard. She stared at my thick cock on the screen and begin to salivate. She knew it was so wrong but didn't really care. I was in a panic wondering what to do, I messaged Rachel and told her I'd message her later because something just came up, she was pissed and told me to go fuck myself but at that point I didn't really care. The fact that I hadn't got a reply from Sinéad really fucked with my head. I felt like I'd really fucked up and decided to message first.