Boyfriend farts (spicy topic!)

He farts while I'm giving him oral and it's not just one or two, but a whole silent/semi silent row of extremely spicy and poison rotten smelling gas. He locks me under the blankets "to keep the spice quality in", he says. If I don't give him oral he farts in his hand and puts it under my nose. I hate it. Can you give him some advice besides calling his mother and telling him what he does is giving me a hard time?