you were tickling TB, pinning him down by holding his legs. Tennisball is laughing uncontrollably. You're smirking mischievously, tickling his feet in an intense rate, while he's trying to struggle his way out, as he's thumping his feet on the floor.

Tennisball: hahh!! HAHAHAHA!! he- he-he- hehh- HIC! HIC! HEHH! B-BE CAREFUL THAT'S TICKLI-I-ISH!! ҺЕНЕНЕН- HIC! HAH GASP- AH-AH- BWAHAHAHAAH!!! THUMP THUMP