How to tell my Scorpio that I love him?

I've known this Scorpio guy for years.. He is so mysterious, gorgeous and just intrigues me. As another Scorpio myself I feel we have a deep connection and understand each other well. We are just friends but I love him and just haven't had the courage to tell him.

Lately this girl has been hitting on him hard. She is Leo (August 7) and constantly flirts with him all the time. She'll tossell his hair when she see's him and act all cutesy. He doesn't show her interest but she is his sister's best friend and she is really pushing him to ask her out. Leo girl is intent on getting her way with him and I'm really sad that she is going to succeed only because his sister is trying to convince him to date her.

Knowing how loyal Scorpios are to the people they get involved with I'm afraid that if he does fall for Miss Leo that I'll lose him forever to her. Honestly, aside from being drop dead gorgeous she doesn't seem like his type. But his sister keeps telling him how great she is and they'd make a great couple and to just give her a chance.

He and his sister are really close and I know he would never want to let her down. How can I tell him how I feel without scaring him because I know Scorpios hate to be chased, before little Miss Leo steals him away?