Makes sense she's getting pleasured by the vines. She's in a skirt, which makes it easier for the bones to push back her panties and reach her g spot. The guy has his pants buckled on and theres no room in the pant legs for the vines to reach his p spot. So of course he's going to feel jealous. She's getting off and he's getting more sexually frustrated watching the aliens have sex.
Makes sense she's getting pleasured by the vines. She's in a skirt, which makes it easier for the bones to push back her panties and reach her g spot. The guy has his pants buckled on and theres no room in the pant legs for the vines to reach his p spot. So of course he's going to feel jealous. She's getting off and he's getting more sexually frustrated watching the aliens have sex.