It doesn't seem like a hand will be enough for this stud, so

Mercy Horse Handjob (wiloh95)

Mercy x Horse (ComandoRekin) [Overwatch]

Pharah vs Mercy [Overwatch] (dreamrider)

Mercy get that Horse cock in the ass

Ayane VS Powerful Horse Cock (Blueberg)

Office Mercy x Horse (Overwatch) [TheBartender]

Witch Mercy fucked by a Horse (theBartender) [Overwatch]

Mercy giving her horse a hand (wearabletraps)

Mercy taking a horse cock in her ass and gets gaped(zmsfm)

Pharah getting her pussy stretched by a big horse cock (thebartender)

Dog vs Horse (jackerman)