How do you be suggestive with a friend without risking coming off too strong?

I feel like attraction is building between myself and a friend slowly over the last few weeks and I don't know what to do.

she's a shy person so tends to close up when she feels attraction, emotions, intimacy etc and go into like a shell, when most other people become physically expansive. So while most people would move towards someone if they like them and try to touch, she closes up and pulls away.

We're beginning to do more relationship things together and a bit of tension is beginning to form I feel but I don't know how to progress it. I feel like because she's my friend I don't want to just take the lead because that could ruin the friendship if she's not ready or hasn't made her mind up yet. For example we ended up laying in a field together last week on a rug star gazing. I felt like there was lots of feelings forming and 99% of girls I'd just turn over and kiss them because they obviously like me, but because she's my friend you can never be sure she's not just being friends and it's risking it.

There have been a few times recently where I've felt like we should kiss but I don't feel like I've got enough green lights from her yet. According to some things I've seen online I should wait and allow the tension and spark develop a little longer so she'll begin to make it more obvious, but what are some ways I could make things go down this direction when we hand out?

How do you be suggestive with a friend without risking coming off too strong?
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