Hello & ?'s about my 2 new male guinea pigs

Hi everyone!! My name is Heather and our family just became guinea pig owners a month ago. We first bought Bugsy and then a week later purchased Coco, both males. Bugsy did a lot of rumble strutting but up to about two days ago they seemed to get along fine. They constantly slept in the same igloo or the fleece pouch i bought for them. Two days ago Coco, the younger one started face mounting Bugsy CONSTANTLY. Bugsy is pretty patient with it but then I notice he shakes Coco off but Coco just keeps coming back for more. A few times I've noticed Bugsy's hair start to stand up around his face. Today I heard some loud squeals in the pouch. But I've checked them and no bite/scratch marks. Is this normal behavior or do I need to separate them? Also, we have a 2 x 6 C&C cage :0)