10 useful phrases in Japanese, starting the relationship

Anata no koto, suki-desu. (I like you, or I love you)

Tsukiatte-kudasai (Can you go out with me, please? / Can you be my lover?)

Isshoni gohan ikimasennka? (Would you like to go for dinner/lunch together?)

Isshoni nomini ikimasenka? (Would you like to have a couple of drinks together?)

Watashi no heya ni kimasenka? (Would you like to come my place/flat?)

Konya issho ni itai. (I want to be with you tonight)

Issho ni Hotel ikitai. (I want to go to a love-hotel together)

Kisu shitemo ii-desuka? (Can I kiss you?)

Hagu shitemo ii-desuka? (Can I hug you?)

Ecchi-shitai. (I want to make love with you)