It's the small things that give it away.

A questioning look.

A raise of the eyebrow.

Toast in the morning.

"Tea?"

Food in the cupboards.

Milk in the fridge.

A shelf especially for body parts.

Two microwaves: one each.

And the subtle touches.

A brush of against his arm.

A breath over his shoulder.

A foot under the table.

Holding open the door.

Passing a towel.

Hailing a taxi.

Offering a steadying arm.

Sharing his feelings.

Biting his tongue..

Holding a hand.

Caressing a cheek.

Leaning on a shoulder.

It's the small things that tell Sherlock that John loves him.