Scarlett Sinns from I use my tongue to lick her armpits while tickling

Vika is a very tall girl, but not too tall for my wooden bondage board. I have her stretched out with her wrists bound securely at one end, and her ankles bound at the other. I have additional leather straps going around her knees, hips and elbows, making her completely immobile. I especially love this position because it gives me such easy access to Vika’s fully exposed and vulnerable armpits. She can’t do anything at all but suffer as I spend the entire time ruthlessly tickling her ticklish underarms. There’s even a few times where I use my tongue to lick her armpits while I continue tickling them. Vika laughs and struggles, but she can’t move, nor can she do anything to stop the tickle torment that I’m inflicting on her armpits!