I don't think there's tension between them now not like it was in the early part of the season and even then Stefan saved her form Kat. You really think he barks orders at her? cause I've never took it that way he pretty much comes across as begging Bonnie for help if you ask me like even Damon knows to bring Stefan along cause he knows there's a good chance Bonnie will say yes to Stefan kinda shows a lot about her opinion of him that she's always telling him yes.