A while back a friend of mine accidentally put a dick pic into the boys whatsapp chat, he quickly deleted, but not quick enough one of us saved the pic and in fun banter joked about it. I told my gf what happened and she was interested and curious to see what it was like. To be fair to my friend he has a massive cock , hence the jokes was it an 'accident' he sent. Well my girlfriend saw it and her jaw dropped and she made comments on how big it was. I got to admit it was fun and exciting to hear and I got a boner. She saw and in shock was like 'omg do you actually have a boner' After some back and forth it kind of turned into a bit of a role. She then jerked me off with one hand and held my phone in the other hand making comments of how big my friend was and how strange it was for this to turn me on. She said how I only get her hand and not her mouth. Then she grabbed a mug that was beside us and told me to finish it there.