There’s talk too.
Just after 18:20 she says “I wanna play with this foreskin” as she pull it forward over his glans.
Sucking & nibbling (no teeth) follows.
Then she says “I’m just gonna put my tongue in there” followed by tongue insertion.
18:45 - “Nibble on it” (gentle biting).
19:00 - The she inserts her thumb and says “Stroke it while my thumb’s in there?” and does exactly that.
There must be at least 5 or 6 scenes with her playing with Keiran’s foreskin.