He's in denial
He's really comfortable in his friendship, so he's refusing to let it evolve into anything more. Because subconsciously, he's afraid if he admits he likes her he'll ruin the friendship. That's how I read it, anyways. There's supporting evidence for this, like when his friends were discussing Tomo's . . . "attributes" and he smacked them around until they stopped, but absolutely refused to acknowledge that he had any feelings for her at all
getting past sadpanda isn't even hard even if you don't have the plug-in, especially if you're on incognito mode on chrome. all you have to do when incognito is to log in at ehentai forums, no need to **** around with cookies or cache or ***************
If you don't mind a very minor spoiler the few comics that have been published after this one have Misuzu and Carol (the blonde airhead) getting ready to take Tomo shopping for feminine clothes so Jun won't be able to misunderstand what her intentions are so it looks like things are progressing, at least a little
and if not, hey, at least we get a shopping episode