Scene 1. Demetrius and Helena waking up.

Demetrius waking up, babbling nonsensically for a quarter minute. Blinks for a few seconds, looks over his shoulder, looks back -- waits a second, looks back over his shoulder surprised.

Demetrius: What on earth are you doing so close to me?
Helena: Why, don't you remember last night?
Demetrius: ...Last night? What did you put in my drink?!
Helena: Don't be silly.
Demetrius shudders, then looks at himself.
Demetrius: ...I need a shower.

Scene 2. Demetrius on his way to the "water hole"

Demetrius is whistling as he walks.
[Enter Puck out of nowhere]
Demetrius: Aah! Who the heck are you?
Puck: That isn't your concern.
I'll tell you what, though.
Do you know what happened yesterday? Between you and Helena?
You were under the influence of (does finger quotation thing) "love juice".
Someone that was (makes a really obvious look) definitely not me applied it to you.
I can see you have a strong desire for this girl, Hermia.
Demetrius: Oh my, yes. She is the most beautiful, amazing, se--(Interrupted by Puck)
Puck (Sarcastically): Yeah. That's great.
Puck: Anyway, I have retrieved the "love juice" from that person who was (obvious look again) definitely not me.
Puck: Whomever you apply it to, will fall in love with the first person they see when they wake up.
Puck: If you would be willing to use it just to open her eyes... think about it.
[Puck disappears]
Demetrius: Think about it!? 
Demetrius grabs the love juice abruptly, and goes back.

Scene 3. Hermia lying down, Lysander is leaving, Demetrius is entering.
Demetrius: Lysander! Is Hermia awake yet?
Lysander: Not so loud! Hermia is still sleeping. I'm going to go find something to eat. Don't wake her.
[Lysander leaves scene]
Demetrius: Heh.
Demetrius applies the "Love Juice" to Hermia.
Demetrius shakes Hermia lightly.
Demetrius (whispering): Hermia.
Demetrius (Talking Normally): Hermia. Hermia?
Demetrius (Talking loudly): Hermia!
Hermia (Groggily): What is it?
Demetrius: Oh, I'm sorry, did I wake you?
Hermia: Oh, no, it's my fault. I should be awake by now, honey.
Demetrius (breaking character, looking at the audience) Honey?! Hah! It worked!
Hermia: You know, I never realized how much smarter, funnier, and better looking you are than Lysander!
I never realized how stupid, boring and ugly Lysander is in relative comparison to you!
Demetrius (Breaking character again): Maybe I applied too much?
Lysander: Oh Hermiaaa... I'm baaack...
Hermia: Thou spongy onion-eyed canker-blossom!
I am in love with Demetrius now!
Lysander: Huh?
Demetrius: Why don't you go run off with Helena or something, Hah!
Lysander: NOOOO! Thou puking ill-nurtured flap-dragon! What did you do to her!

Scene 4. 

This is all I have so far...