Is it normal that my cousin girl practicing stuff with me

Hi friends
I am 26 year male. i have three cousin girls(my mother's younger sister's daughter) who are all of aged 25,24 and 22 respectively. My cousin's house are located 4 km away from my house and only the younger cousin (22 age) is there with her parents while other two cousins are out of town.
My younger cousin(22 aged) and myself meet monthly once in my grandmas house. she is a good girl and very kind and care for me.
If we both are going outing she used to hold my hands tight to her breast and also while travelling she used to lie in my shoulder which make me arouse.
If nobody is nearer other than us she used to sit very closer to me seems to be sit over my lap and make me feel her buttocks and lean over me and also rub my cheeks gently. sometime i used to get much arouse and try to rub her breast casually and she also knows it and will let me doing. and in another day she was just showcasing her breast curve lying back on bed while i was sitting near to her head in the same cot. But she used to sms me 'anna' when we chats. I was really confused by her. Please let me get the following doubts answered

1.Is this normal for her to making stuff and arousing me.
2.Sometimes i get tempted and touches her breasts and there is no opposition from her whether she like that too.
3.Chatting me 'anna'(brother) but rubing her breasts over me can i do the same
4.I am able to judge that she is in love with me shall i ask it to her.
5.I am getting very arouse of her practices so nowadays feel of sex with her and masturbating by just reminding her.
6.If so can i have safe sex with her.

Please get rid me off this confusions