[ he leans down, giving Emet-Selch's leg a pat as if to test for firmness before he moves to take a seat. he'd like to sit facing Emet-Selch but with the chair arms in the way he can't really straddle him, so he chooses to sit with his back facing him on his lap --

before he slinks downwards, legs going over one of the chair arms, sprawling in his lap like a lazy cat. ]