since this is not specified i will answer for both weskttore and willbert
weskttore typically talks to each other professionally actually but theres always the slight bicker from dottore that could come off as flirting, ESPECIALLY the way wesker would respond to it
willbert would talk with a hint of romance but neither of them even notice the fact and their coworkers are giving that homophobic dog stare when they're working together in the lab