Adult version of Tanya Degurechaff from The Saga of Tanya the Evil riding a guy cowgirl style as she gives him a footjob. She'd be naked with her hat on and have a furious expression as he cums.
77 EVs Repanse de Lyonesse from Warhammer, riding cowgirl with her feet fondling the guy's balls. She'd be wearing her breastplate/torso armour, and her expression would be very serious. Refs and pose suggestions attached.
Becky Farrah and Rally Vincent from gunsmith cats in a POV threesome, Rally giving the guy a footjob whilst Becky rides reverse cowgirl. Pose attached, character refs in this link.