As sion, Both of you are lane brush abusers so keep the brushes warded at all costs in this matchup for maximal effectiveness.

If he goes to some other lane, just push the wave and get as many plates as you can in this matchup. This is specifically true if he uses his ult.

During fights, watch for flanking opportunities on the enemy. Getting to his backline will be relatively easy once he has initiated an all-in.

Keep the wave close to your tower. The enemy has no sort of sieging potential and can be easily exposed to ganks. As sion, If he goes to another way, just push the wave and get as many plates as you can in this matchup. This is especially true if he uses his ult. During the fighting, watch for occasions to flank the enemy. Going to his back will be relatively easy once he has initiated an all-in-one. Keep the wave near your turn. The enemy does not have some kind of sifting potential and can easily be exposed to the ganks.