I've been in a relationship for about 10 months with a girl.

I think it goes without saying that if we have sex she feels closer to me and showers me with compliments. etc.

However, the problem is that due to her work schedule and my work schedule, we simply don't get that much alone time. She also has kids and this can be a problem.

How can I build sexual interest with her during these times when we are apart?

She's not into phone sex. Also, she has kids around.

I've thought about sending her some text messages that are covert but nothing too explicit.

Recently, we read parts of "50 shades of gray" together and this turned her on. I've thought about downloading that book and then talking about it over the phone or via text.

I always throw in that sexual vibe pretty much whenever I get the chance.

So , when I bring her a coup of tea I'd say something like :"Ok , now put it in your mouth".
I sometimes say :"That dress is horrible , let me take it off for you"
If she asks me to help her with a random object :"Yeah sure , where do you want it ? or where do I put it"
If I pay dinner and she wants to pay me back I'll say :"Yeah,dont worry about it. I accept sexy photos or even better , videos. Your choice."

I always smirk or laugh seductively when I say this kind of things so she understands that it's a joke.You are joking but for 1-2 seconds she thinks about it. She makes a visual image in her head of whatever it is you're implying. This builds sexual tension.

Just don't be boring. If you project an adventurous personality she'll want to be adventurous with you. People tend to go with the flow.

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I'm relatively new to the PUA lifestyle, but before getting into it I still had experience with women.

What I would do is surprise her randomly at her job with a gift (flowers, notes, candy, etc)
You can even go to the extent of making your own coupons lol. For example, "This coupon is good for one free back massage, etc.

If you really want to get alone time with her, contact a friend/family member of hers to babysit because you're planning something special for her.

Then do something like a candlelit dinner with some music and set the mood. Women love guys who are spontaneous and can think quick on their feet. We're the men for a reason.

So I would say do something dealing with a surprise for her and I'm sure that will definitely keep intimacy between you two going. Let me know how it goes!

This is kinda AFC-ish. Don't get me wrong , it's a good idea to surprise her, just don't do it in a way that every other guy does it.
I actually had flowers delivered to a girls house ,from me , while I was there. She's never gonna expect it to be from you since you're already there,right ?
Not bad but not sexual either.
This is good , but something special doesnt' mean something cheesy. Think outside the box.
Yes,they love guys like that but also love guys that give them unique-ish experiences.Things that not every other AFC would do for them.

Your average flowers dropped at work and all that stuff will only get you "Oh ,what a sweet guy he is". It doesn't get you " I'm so gonna bang his brains out tonight".

I woke up one morning , drove to my girl's doorstep at 9:00 AM ,woke her up and told her we're going snowboarding. She'd never been snowboarding. It was a unique experience , it was spontaneous and she loved it.
The difference is that she wouldn't have responded so well to something so stereotypical as a walk in the park or whatever,

_________________
I know my place. It's me on top of the world.

My in depth texting & dating guide.
There's no such thing as shit-tests.
How to keep a girl.