I see Mob as someone who would love oral sex, both giving and receiving, but especially giving. He loves receiving because it's a form of sex that's gentle and soft to the touch while still being highly stimulating. He loves giving because he's an "acts of service as a love language" / "my partner's pleasure is my pleasure"-kind of guy in general, but there's a very particular joy he gets from hearing moans of approval as he goes down on them with his tongue and tasting them. (Obligatory "Mob loves milk" here)