For some background. I have been in a LTR relationship with a girl that is 4 years older than I am. I am 25, and she is 29. I believe she is what most people on here consider a "Unicorn".

She has had 1 sexual partner in the past that lasted for 4 years, ending because she couldn't take the abuse from the guy anymore (he was a somnophiliac and woke her up regularly in the middle of the night to have sex with her). She told me it got to a point where she was feeling like her body wasn't respected, had serious impacts on her work/professional career, and got out of the relationship. Since then, she took a year break from dating, before meeting me in grad school. We are both engineers with me pursuing my Masters, and her going for her PhD. She used to work for a major telecommunications company, before heading back to school to pursue her doctorate (her undergraduate is in electrical engineering).

On top of her grad school work, she is an excellent cook, with her coooking 70% of our meals, and me the other 30%. She voluntarily cleans my apartment, as well as sometimes even doing my laundry (I don't ask her to do this, but she likes making my life easier).

Sexually, we have a strong D/s dynamic with her as the sub, and me as the Dom. We have 25 rules drawn up, and I have final say over her choice of clothing, work out schedule (at least 4x a week), hairstyle, and punishments when certain rules are broken (ie: not shaving her pussy at least twice a week, or wasting my cum). She has rules on how to present herself to me (hair up, sexy clothing, kneeling while presenting her collar, and leash in her mouth). She likes giving head and includes it in every play session, which is usually at least once a day as we both have high libidos.

She has met my parents and siblings, and treats both entities with respect, going as far as to bake my parents a dessert for xmas, and buy both my siblings small presents.

Basically, she is in almost every way my dream girl. Super sexy, petite (5' 1'' and 95 lbs), and academically, smarter than I am by making better grades in one of the same courses we were taking. She even went as far as helping me understand a problem a year after she took the class.

My only potential problem with this, is that she's 4 years older than I am. I have told her that I won't be anywhere close to even thinking of marriage until I am 30, to which she says she understands. However, I would like to get TRP's opinion on how I should proceed from here. Since she is 29, I don't want to waste her time if I know this relationship won't work out in the long run. But on the other hand, we're so compatible sexually and otherwise, than it would kill me if she was to become another man's sub/gf. In the 1.5 years we have been together, we have not had a single argument. She always has a smile on her face and genuinely makes me feel calmer just by looking at her (cheesy I know, but the truth).

I apologize for the long post, but what do you guys think?