Consider Galatians 5:19-24 English Standard Version:
19 Now the works of the flesh are evident: sexual immorality,
impurity, sensuality, 20 idolatry, sorcery, enmity, strife, jealousy,
fits of anger, rivalries, dissensions, divisions, 21 envy,[d]
drunkenness, orgies, and things like these. I warn you, as I warned
you before, that those who do such things will not inherit the kingdom
of God. 22 But the fruit of the Spirit is love, joy, peace, patience,
kindness, goodness, faithfulness, 23 gentleness, self-control; against
such things there is no law. 24 And those who belong to Christ Jesus
have crucified the flesh with its passions and desires.
And Matthew 5:27-28 English Standard Version:
27 “You have heard that it was said, ‘You shall not commit adultery.’
28 But I say to you that everyone who looks at a woman with lustful
intent has already committed adultery with her in his heart.
So if you have intentions in your heart to start a relationship that promotes the positive things mentioned and keeps away the bad things mentioned, I can't see that being a sin.