I don't know if this could be considered as a session but well, here you go:
Victim: my ex girlfriend
Where: in her room
When: during my high school days
What she wears: sleeveless top and shorts (her shirt was a bit short which revealed her tummy & belly when she stretched out her arms)
Using my lap as a pillow, she laid down on a mattress where I was sitting and then she stretched her arms to hug me from that position. Of course I didn’t waste that chance and mercilessly tickled her widely exposed underarms. She laughed and tried to turn her body left and right, but didn’t release her hug or lower her arms. Instead, she hugged me even tighter.
After I had enough torturing her underarms, I moved to her revealed belly. She finally released her hug and grabbed my hand that was tickling her belly, but I used my free hand to grab back and hold both of her hands. I finally stopped and released her after she had said that she couldn’t breathe.
After the session, she asked me whether I had enjoyed tickling her that much because I had got (sorry) erected during the session and it had accidentally touched her head. I felt really embarrassed back then because it was also my first time confessing to other people that I have a tickling fetish. But lucky me that she didn’t concern that too much and in the end, she had become my tickling partner before we finally broke up.
That’s all, I hope that helps.
P.S: sorry about my bad grammar since English is not my native language.