Let us not get into who does what and why because that requires deep analysis. If you want to put an end to it you have to take your Bhabhi in to confidence. Talk to your Bhabhi about what both of you are heading to and explain that it’s time to behave sensibly for both of you. Self control over your behaviour is a key here. Try to accept your wife, spend quality time with her to create more intimacy. Prepare your Bhabhi to accept this by discussing consequences of reacting to your intimacy with your wife.