just a suggestion...
Your sis questioned your finger banging skills then got you to 'prove it'. She has successfully got you to fingerbang her twice, and your reward was to get a taste of her pussy.
If you want to step it up might I suggest you mention your oral skills ('women say I've got a great tongue') and then allow her to mock you before she (inevitably) says 'prove it'.
After that you might want to steer the conversation into her exploits with guys and see if you can lure her into bragging about her oral or hand job skills, and then ask *her* to 'prove it'.
As you've realised she doesn't want any overt sexual activity, but if it's masked as something else she seems quite willing. I think something as simple as saying "I won't look" and placing a pillow/towel over your head will be enough for her to convince herself she's not really having sex with you.
As others have said, she clearly want it (eventually) but needs to get there through these little baby steps you're both taking
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