I play a ysoki technomancer with Grenade Proficiency. A few times, I've gotten away with a grenade or two stuffed in my cheeks, but the question came up of how many grenades could potentially go in there if we really wanted to commit some shenanigans (Most of them involve Raise Dead and Quick Draw).
We've established in the rules that grenades are Bulk L.
With that in mind, How many grenades could a Ysoki without any modifications to their cheeks put in their cheeks before they drop them according to the rules as written?
Note, This may be similar to this question about a drone going into a Ysoki's cheek