Theis mutual non-spoken chemistry between them is just so inexorable to happen anytime between them no matter how much they force ti to not happen or rush it, it'll happen anytime soon or later and they could realize that perhaps females weren't for them or not just they. Might go either fully gay or bisexual but there is no way these pair just stand ever as close straight friends between them, and if they do might be lying each other and keeping always tension between them untill someday that tension just overflows into a more unhealthy way for them.