Of course he does

Giving one final check that there was nobody home, Sam sat down and opened up the messages. First he looked at the conversation with John. Scrolling up he was relieved to find they'd only become friends that morning rather than being a long standing thing. He began to read...

Ellie: Hey there! I can barely walk this morning but it was soooooo worth it! x

John: Well after you refused to let me leave until I fucked you one last time you can only blame yourself!

Ellie: Ha ha! What can I say a girl's got needs and you certainly know how to see to them. Anyway here's a little thank you for last night to keep you entertained whilst you are at work..."

John scrolled down to see the picture that Ellie had inserted into the conversation:

Sam felt his dick stiffen as he studied his step sister's perfect breasts. For years he'd dreamt about them, the fact that Ellie kept them so hidden only adding to their mystique. Eventually he drew his eyes away from her magnificent tits to continue reading the messages.

John: Fucking hell, you are so hot!

Ellie: Hot.... and very, very wet. I haven't been able to stop thinking about you and your ginormous dick all day! x

John: Well play your cards right and you might get another visit from me and my ginormous dick!

Ellie: Ha! Don't pretend you don't want me as much as I want you! Skype me as soon as you finish work x

The realisation hit Sam that last night may not have been the one off he'd hoped it would have been. He switched tabs to see what Ellie had been chatting to her best friend about.

Ellie: Breaking News: Ellie Spends Night Getting Fucked by Hot Stud with MASSIVE Dick!!!

Jess: Ha ha you go girl! Give me ALL the details!

Ellie: So I was out with the girls last night and this guy came up to me - he was kind of cute and fairly ripped, but obvious he was only after one thing.... well he got that and more! We had a dance and I could tell he was packing, one thing led to another and we ended up back at mine. And when I took off his pants Jesus Christ he had the biggest cock ever! We fucked a couple of times, fell asleep, then I woke up to him eating me out... after I came I decided I had to take that monster cock in my mouth and sucked him off. We fucked again before he had to go to work. BEST NIGHT EVER!!!

Jess: And I thought you were such a nice, innocent girl as well!

Elllie: Ha! Everyone thinks that. Did I mention that he had the biggest most perfect cock ever?

Jess: Maybe once or twice! Are you seeing him again?

Ellie's final reply was nothing but an emoji with a great big grin. Sam felt horny as hell from reading Ellie's exploits and knew there was only one thing to do.... he re-opened up the picture she had sent John, undid his trousers and jerked his dick to the image of his topless step-sister grinning innocently for the man he despised more than anything. Within minutes he was ready, groaning Ellie's name as he came.

After cleaning up and putting Ellie's computer back to how he found it, Sam went up stairs, showered and then fell asleep.