Stay focused on your relationship with your girlfriend and avoid getting carried away when your girlfriend’s sister is around your presence.

Consistently doing this keeps you from getting attracted to your girlfriend’s sister.

The priority has to be what you are doing in your relationship with your girlfriend.

Break out of the rut of doing the same old activities.

Do the work to improve your relationship with your girlfriend to make it as interesting and exciting as possible.

This prevents boredom and complacency setting in.

Boredom and complacency is the killer of relationships.

This is where the partners become so comfortable with each other, they lull themselves into a safe and lazy lifestyle where they aren’t doing any new activities or meeting new people.

Once this commences, the relationship is on life support, but neither party is aware of it.

Boredom and complacency sets in.

Each and every day in the relationship is filled with monotony, and the energy gets sucked out of the relationship like that of a punctured tire.

Remember what it was like when you first met the girl who is now your girlfriend?

Remember how excited you were about getting to know her and discovering what made her unique?

Remember how badly you wanted to impress her?

Well, you have lost that gusto and energy.

Once you lose something like that, it is tempting to look elsewhere, and your eyes wander.

Unfortunately, those wondering eyes land on your girlfriend’s sister.

At this stage, you realize that she has qualities that you are missing out on in your relationship with your girlfriend.

She has a spark or a sense of mystery about her that is so enticing.

It reminds you of the energy you felt when you first started dating or talking to your current girlfriend.

You want that experience back, craving the thrill that comes with getting to know someone totally new all over again.

Whenever she smiles, you wonder whether she smiled as a result of thinking of you.

There is so much you want to relate with her on, believing that she must be the most interesting person in the world.

There are so many questions in your head, given that you are ravenously curious about this girl.

This is where you lose sight of your own relationship, and become increasingly attracted to your girlfriend’s sister.

This is why you must be extremely cognizant of your thoughts whenever she comes into mind, or she is in your physical presence.

Keep those thoughts in check by redirecting them to thoughts of your girlfriend.

Figure out what other experiences you are interested in having with your girlfriend and start doing them.

Ask her questions about herself that you never have.

Expose her to new environments and observe how she responds to them.

Take a chance by encouraging her to tell you something new about herself every time you talk to her or go out with her.

Do activities with her that she has repeatedly asked you to do with her and refused to do so in the past.

Open yourself up to these activities so that you find additional areas to relate with her.

As you consistently work towards invigorating your relationship, you become that much more excited about your girlfriend.

The excitement is akin to what you felt when you were in the early months of dating her.

It’s exhilarating.

Eventually, the attraction to your girlfriend’s sister goes away and you are completely engrossed in your relationship with your girlfriend.