Keep in mind this is Stag/Vixen. There is no humiliation, shame or embarrassment that you might associate with cuckolding.
The wife is resting her head on her husband's lap. She probably just sucked his cock. The "new guy" she selected for the 3some is kissing her passionately while he's fucking her.
I suspect he's actually cumming in her. Her toes are spreading and she seems to be clinging onto her husbands leg to get that skin to skin contact with him, even though another guy is pulsing a load inside her.
Her grip on her husband may be a way of signaling to him that she can feel the other male's sperm squirting in her and that the husband will be next to finisher her off with a second load.
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